Multiple nginx instances - ssi problem/bug

Hi Guys,

We are having some very strange and intermittent issues with ssi.
When the problem occurs ssi is not executed at all, causing our site's to not display properly.
Reloading nginx mostly fixes the issue.

We are using nginx version 1.8.1 and have 4 to 6 instances of nginx running on a host.

On servers running only one instance we have not seen this issue.

Anyone else experienced this ?

Kr,
denpowel